There is no "story" so its kind of peaceful / zen / solitary experiance which is nice, but also things try really hard to kill you at times which gives this mix not everyone will enjoy.

It can be played in various ways and speeds, solo makes it easier to pick a right pace.
I play mainly with friends but sometimes they are not there and its still fun solo.

One advice, dont be afraid to die early, it will save you trouble later. The game throws you some curveballs at the start of new biomes. And if all else fails, you can call up on recovery squad here or whatever other forums, people are generally helpful.

In the end there is nothing solo cant do easily, rather the learning experiances are tougher whout a wingman to get you out of touble.